Reduce number of git calls when displaying prompt (#3795)

The avit theme's _git_time_since_commit function was running git twice. Reduce it with a single call to `git log`, checking the exit code for success.

Reduce number of git calls when displaying prompt (#3795)
f9d4a067 · Cory Snider · Marc Cornellà · 15d051c3 · f9d4a067
Commit f9d4a067 authored Apr 15, 2018 by Cory Snider Committed by Marc Cornellà Apr 15, 2018
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avit.zsh-theme themes/avit.zsh-theme +1 -3

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--- a/themes/avit.zsh-theme
+++ b/themes/avit.zsh-theme
@@ -50,9 +50,7 @@ function _ruby_version() {
 # use a neutral color, otherwise colors will vary according to time.
 function _git_time_since_commit() {
 # Only proceed if there is actually a commit.
-  if git log -1 > /dev/null 2>&1; then
+  if last_commit=$(git log --pretty=format:'%at' -1 2> /dev/null); then
-    # Get the last commit.
-    last_commit=$(git log --pretty=format:'%at' -1 2> /dev/null)
    now=$(date +%s)
    seconds_since_last_commit=$((now-last_commit))